The AT89C2051 is a low-voltage, high-performance CMOS 8-bit microcomputer with 2K bytes of Flash programmable and erasable read-only memory (PEROM). This device is manufactured using high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the AT89C2051 is a powerful microcomputer that provides a highly flexible and cost-effective solution to many embedded control applications. The AT89C2051 offers the following standard features: 2K bytes of Flash, 128 bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five-vector two-level interrupt architecture, a full-duplex serial port, a precision analog comparator, on-chip oscillator, and clock circuitry. Additionally, the AT89C2051 is designed with static logic for operation down to zero frequency and supports two software-selectable power-saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next hardware reset.‍

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